Proceedings on Automation in Medical Engineering
Vol. 1 No. 1 (2020): Proc AUTOMED

Modelling and control, ID 004

Automated cancellation of direct feedthrough in magnetic particle imaging

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Jonas Schumacher (Universität zu Lübeck, Institute of Medical Engineering), Thomas Friedrich (Universität zu Lübeck, Institute of Medical Engineering), Matthias Graeser (Institute for Biomedical Imaging, Technische Universität Hamburg, Hamburg, Germany), Thorsten M. Buzug (Universität zu Lübeck, Institute of Medical Engineering), Philipp Rostalski (Institute for Electrical Engineering in Medicine, Universität zu Lübeck, Lübeck, Germany)

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Abstract

Magnetic Particle Imaging (MPI) uses oscillating magnetic fields for measuring the spatial distribution of magnetic nanoparticles. Due to the simultaneous excitation and acquisition, a feedthrough voltage is induced in the receive coil, limiting the available dynamic range of the converters for the digitization of the particle response. This can be overcome by using an automated cancellation process based on an adaptive feedforward control algorithm. The FPGA implementation shows a dampening factor of ?=2.7±0.3 compared to an ideal factor of ?=4.6.

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